A026900 T(2n+1,n+3), T given by A026780.
1, 8, 47, 248, 1251, 6194, 30496, 150348, 745086, 3719388, 18721063, 95045190, 486669349, 2512426480, 13070589618, 68484870582, 361191120212, 1916337714194, 10222616034264, 54800827268454, 295084855980404, 1595368824989782
Offset: 2